#include<iostream>
using namespace std;
int gcd(int a,int b)
{
    return b?gcd(b,a%b):a;
}
int main()
{
    int n=0;
    cin>>n;
    while(n--)
    {
        int a,b;
        cin>>a>>b;
        cout<<gcd(a,b)<<endl;
    }
    return 0;
}